Hi Tall Chick! Take your time and pace yourself. Most injuries occur from doing too much too soon or doing too much of a good thing (or bad thing for that matter). Put rest days between your leg workouts and no need to train them more than two times per week.
As for shaping your teardrop, one of my favorite exercises to include in my leg workout is leg extensions. These are done most efficiently on a leg extension machine since you can control your weight selection, range of motion, and have proper back support. However, if you don't have access to a leg extension machine you can modify the exercise at home. Yes, your ability to grow with the exercise will be limited with this method, but it is nonetheless an option to consider.
To do this exercise, put a 5 pound ankle weight on your ankle and sit in a chair (eventually work your way up to using a 10 pound, when your current weight no longer challenges you considerably).
Lift the weighted leg straight out in front of you (be careful to keep a slight bend at the knee joint and avoid locking your leg out in full extention). Now come down only half way and go back to the top. This would be considered partial reps. Do 3 sets of 20 to 25 reps per leg. I like to do the first 5 to 10 reps of each set with full range of motion before continuing with partial reps. If you feel any discomfort in your knee while doing full range, then stick w/ partial reps. If even doing partial reps gives you any knee discomfort then I do not recommend doing this exercise.
Good Luck!